Abstract
The purpose of this paper is to present a detector designed for the localization of the low energy photon. The so-tagged high energy photon can be used as an electromagnetic probe for any nuclear physics experiment. The detector consists of a stack of 16 modules; each module includes a multiwire proportional chamber and a plastic scintillator. The 48-wire chambers have a total detection surface of 96 X 115 mm/sup 2/. The matter necessary for photon conversion is introduced as a massive lead cathode. The gas in the chambers is a mixture of 75% argon, 25% isobutane, and 0.25% freon and methylal. The wires lead to 16 signal outputs per chamber and are connected to low-cost 8-channel hybrid FILAS circuits which consist of an amplifier, a discriminator, a shaper, and a coincidence with a common external gate which allows the data storage in 8 memories. The FILAS circuits are connected to a Schlumberger JCF-20 Camac module. The ''OR'' of the eight signals is used in coincidence with the signal of the associated scintillator to trigger the detector. Photons produce electromagnetic showers in the lead cathodes. The localization accuracy is downgraded by the multiple scattering of the shower particles in the leadmore » foils; to minimize this effect without creating electrical or mechanical difficulties, the anode-cathode gap is 3 mm. A Monte Carlo simulation of the device and the annihilation photon tagging process are also presented.« less
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